I am in the UK and looking at buying a 2019 or 2020 Japanese-market Prius (the Japanese drive on the left of the road, like the UK, and we get a lot of used Japanese-market Prius shipped over for sale in the UK). These are the 'facelift' Gen 4 models. One thing I have noticed is that for the MY 2020-on the engine coolant bottle is smaller in size and the coolant cap is a metal bayonet type that fits on a seperate filler extension rather than a screw-on plastic cap atop the bottle itself, as on Gen 4 up to 2019. Is there any particular significance to this - i.e. is the cooling system changed from earlier models? Also any other changes to the car I should be aware of that took place at this time. Thank you.
